297 lines
11 KiB
Java
297 lines
11 KiB
Java
/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8003258 8029434
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* @run testng Lines
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*/
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import java.io.BufferedReader;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.LineNumberReader;
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import java.io.IOException;
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import java.io.UncheckedIOException;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import java.util.Spliterator;
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import java.util.stream.Stream;
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import java.util.concurrent.atomic.AtomicInteger;
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import org.testng.annotations.Test;
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import static org.testng.Assert.*;
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@Test(groups = "unit")
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public class Lines {
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private static final Map<String, Integer> cases = new HashMap<>();
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static {
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cases.put("", 0);
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cases.put("Line 1", 1);
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cases.put("Line 1\n", 1);
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cases.put("Line 1\n\n\n", 3);
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cases.put("Line 1\nLine 2\nLine 3", 3);
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cases.put("Line 1\nLine 2\nLine 3\n", 3);
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cases.put("Line 1\n\nLine 3\n\nLine5", 5);
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}
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/**
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* Helper Reader class which generate specified number of lines contents
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* with each line will be "<code>Line <line_number></code>".
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*
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* <p>This class also support to simulate {@link IOException} when read pass
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* a specified line number.
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*/
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private static class MockLineReader extends Reader {
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final int line_count;
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boolean closed = false;
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int line_no = 0;
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String line = null;
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int pos = 0;
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int inject_ioe_after_line;
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MockLineReader(int cnt) {
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this(cnt, cnt);
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}
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MockLineReader(int cnt, int inject_ioe) {
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line_count = cnt;
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inject_ioe_after_line = inject_ioe;
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}
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public void reset() {
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synchronized(lock) {
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line = null;
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line_no = 0;
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pos = 0;
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closed = false;
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}
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}
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public void inject_ioe() {
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inject_ioe_after_line = line_no;
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}
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public int getLineNumber() {
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synchronized(lock) {
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return line_no;
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}
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}
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@Override
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public void close() {
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closed = true;
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}
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@Override
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public int read(char[] buf, int off, int len) throws IOException {
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synchronized(lock) {
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if (closed) {
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throw new IOException("Stream is closed.");
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}
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if (line == null) {
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if (line_count > line_no) {
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line_no += 1;
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if (line_no > inject_ioe_after_line) {
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throw new IOException("Failed to read line " + line_no);
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}
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line = "Line " + line_no + "\n";
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pos = 0;
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} else {
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return -1; // EOS reached
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}
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}
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int cnt = line.length() - pos;
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assert(cnt != 0);
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// try to fill with remaining
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if (cnt >= len) {
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line.getChars(pos, pos + len, buf, off);
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pos += len;
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if (cnt == len) {
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assert(pos == line.length());
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line = null;
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}
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return len;
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} else {
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line.getChars(pos, pos + cnt, buf, off);
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off += cnt;
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len -= cnt;
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line = null;
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/* hold for next read, so we won't IOE during fill buffer
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int more = read(buf, off, len);
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return (more == -1) ? cnt : cnt + more;
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*/
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return cnt;
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}
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}
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}
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}
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private static void verify(Map.Entry<String, Integer> e) {
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final String data = e.getKey();
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final int total_lines = e.getValue();
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try (BufferedReader br = new BufferedReader(
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new StringReader(data))) {
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assertEquals(br.lines()
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.mapToInt(l -> 1).reduce(0, (x, y) -> x + y),
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total_lines,
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data + " should produce " + total_lines + " lines.");
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} catch (IOException ioe) {
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fail("Should not have any exception.");
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}
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}
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public void testLinesBasic() {
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// Basic test cases
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cases.entrySet().stream().forEach(Lines::verify);
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// Similar test, also verify MockLineReader is correct
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for (int i = 0; i < 10; i++) {
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try (BufferedReader br = new BufferedReader(new MockLineReader(i))) {
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assertEquals(br.lines()
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.peek(l -> assertTrue(l.matches("^Line \\d+$")))
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.mapToInt(l -> 1).reduce(0, (x, y) -> x + y),
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i,
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"MockLineReader(" + i + ") should produce " + i + " lines.");
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} catch (IOException ioe) {
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fail("Unexpected IOException.");
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}
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}
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}
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public void testUncheckedIOException() throws IOException {
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MockLineReader r = new MockLineReader(10, 3);
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ArrayList<String> ar = new ArrayList<>();
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try (BufferedReader br = new BufferedReader(r)) {
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br.lines().limit(3L).forEach(ar::add);
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assertEquals(ar.size(), 3, "Should be able to read 3 lines.");
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} catch (UncheckedIOException uioe) {
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fail("Unexpected UncheckedIOException");
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}
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r.reset();
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try (BufferedReader br = new BufferedReader(r)) {
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br.lines().forEach(ar::add);
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fail("Should had thrown UncheckedIOException.");
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} catch (UncheckedIOException uioe) {
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assertEquals(r.getLineNumber(), 4, "should fail to read 4th line");
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assertEquals(ar.size(), 6, "3 + 3 lines read");
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}
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for (int i = 0; i < ar.size(); i++) {
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assertEquals(ar.get(i), "Line " + (i % 3 + 1));
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}
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}
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public void testIterator() throws IOException {
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MockLineReader r = new MockLineReader(6);
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BufferedReader br = new BufferedReader(r);
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String line = br.readLine();
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assertEquals(r.getLineNumber(), 1, "Read one line");
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Stream<String> s = br.lines();
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Iterator<String> it = s.iterator();
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// Ensure iterate with only next works
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for (int i = 0; i < 5; i++) {
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String str = it.next();
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assertEquals(str, "Line " + (i + 2), "Addtional five lines");
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}
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// NoSuchElementException
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try {
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it.next();
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fail("Should have run out of lines.");
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} catch (NoSuchElementException nsse) {}
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}
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public void testPartialReadAndLineNo() throws IOException {
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MockLineReader r = new MockLineReader(5);
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LineNumberReader lr = new LineNumberReader(r);
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char[] buf = new char[5];
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lr.read(buf, 0, 5);
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assertEquals(0, lr.getLineNumber(), "LineNumberReader start with line 0");
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assertEquals(1, r.getLineNumber(), "MockLineReader start with line 1");
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assertEquals(new String(buf), "Line ");
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String l1 = lr.readLine();
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assertEquals(l1, "1", "Remaining of the first line");
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assertEquals(1, lr.getLineNumber(), "Line 1 is read");
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assertEquals(1, r.getLineNumber(), "MockLineReader not yet go next line");
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lr.read(buf, 0, 4);
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assertEquals(1, lr.getLineNumber(), "In the middle of line 2");
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assertEquals(new String(buf, 0, 4), "Line");
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ArrayList<String> ar = lr.lines()
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.peek(l -> assertEquals(lr.getLineNumber(), r.getLineNumber()))
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.collect(ArrayList::new, ArrayList::add, ArrayList::addAll);
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assertEquals(ar.get(0), " 2", "Remaining in the second line");
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for (int i = 1; i < ar.size(); i++) {
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assertEquals(ar.get(i), "Line " + (i + 2), "Rest are full lines");
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}
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}
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public void testInterlacedRead() throws IOException {
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MockLineReader r = new MockLineReader(10);
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BufferedReader br = new BufferedReader(r);
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char[] buf = new char[5];
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Stream<String> s = br.lines();
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Iterator<String> it = s.iterator();
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br.read(buf);
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assertEquals(new String(buf), "Line ");
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assertEquals(it.next(), "1");
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try {
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s.iterator().next();
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fail("Should failed on second attempt to get iterator from s");
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} catch (IllegalStateException ise) {}
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br.read(buf, 0, 2);
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assertEquals(new String(buf, 0, 2), "Li");
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// Get stream again should continue from where left
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// Only read remaining of the line
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br.lines().limit(1L).forEach(line -> assertEquals(line, "ne 2"));
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br.read(buf, 0, 2);
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assertEquals(new String(buf, 0, 2), "Li");
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br.read(buf, 0, 2);
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assertEquals(new String(buf, 0, 2), "ne");
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assertEquals(it.next(), " 3");
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// Line 4
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br.readLine();
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// interator pick
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assertEquals(it.next(), "Line 5");
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// Another stream instantiated by lines()
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AtomicInteger line_no = new AtomicInteger(6);
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br.lines().forEach(l -> assertEquals(l, "Line " + line_no.getAndIncrement()));
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// Read after EOL
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assertFalse(it.hasNext());
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}
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public void testCharacteristics() {
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try (BufferedReader br = new BufferedReader(
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new StringReader(""))) {
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Spliterator<String> instance = br.lines().spliterator();
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assertTrue(instance.hasCharacteristics(Spliterator.NONNULL));
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assertTrue(instance.hasCharacteristics(Spliterator.ORDERED));
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} catch (IOException ioe) {
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fail("Should not have any exception.");
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}
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}
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}
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